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    SubjectRe: [PATCH] async: Don't call async_synchronize_full_special() while holding sb_lock
    Dave Chinner wrote:

    >
    > So, given the potential impact of this change, what testing have
    > you done in terms of:
    >
    > - performance impact

    I tested this on my machines and it gave a real performance improvement (11 to 8 seconds for a full kernel tree unlink, and cutting out
    latency for normal applications)
    > - sync() safety
    that was exactly the synchronization point that's discussed here.

    > - removing a million files and queuing all of the
    > deletes in the async queues....

    the async code throttles at 32k outstanding.
    Yes 32K is arbitrary, but if you delete a million files fast, all but the first few thousand are
    synchronous.



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